The Best Moisture Meters for Mold Detection


Many households have a mold problem without people even realizing it. Most mold usually hides out of sight and one of the more common places it hides is behind drywall. If you can smell a musty earth-like odor or if your allergies flare up when at home then chances are fairly good that you have a hidden mold problem. If you suspect you have a mold infestation behind drywall then there are a number of steps you can take to confirm this to be the case. Moisture feeds mold which is why a good quality moisture meter serves as an excellent indicator on whether or not you have a hidden mold problem.

Table of Contents
  • Types of Moisture Meters
  • The General Tools MMD4E Moisture Meter
  • The General Tools MMD7NP Pinless Moisture Meter
  • The General Tools MMH800 All-In-One Moisture Meter
  • Moisture Meter Comparison Table

Types of Moisture Meters

When it comes to choosing a moisture meter you will have 3 types to choose from. There are pin-type moisture meters, pinless moisture meters and all-in-one moisture meters.

Pin-type Moisture Meters

Pin-type moisture meters can be recognized by their dual pins. The pins are penetrated into the surface of the desired area you want tested. It only reads the moisture levels up to the point where the pins end. The reading level which is given in %MC is determined by the electrical resistance between the two pins. The pin type can give readings on any surface it can penetrate; therefore using a pinless version would be better for impenetrable surfaces.

Pinless Moisture Meters

Pinless moisture meters have the ability to detect moisture levels up to 1″ deep. They are ideal for trying to determine the moisture levels behind bathroom tiles and various types of flooring. The only downsides to the pinless type is that it will give false readings on metal surfaces, it will not be able to give a reading unless the surface area is 100% flat and if the surface area you are attempting to read is too thin it will give you the moisture level of whatever sits behind it.

All-In-One Moisture Meters

The all in one type is the preferred version among building inspectors, IAQ and flooring specialists as it’s capable of taking readings with and without pins.


The General Tools MMD4E Moisture Meter

General Tools MMD4E Moisture Meter

The MMD4E Pin-type Moisture Meter fits comfortably into your hand and has an LCD display screen to give you clear readings. The stainless steel pins will give you accurate readings on the moisture levels in subflooring, wood, concrete and drywall.

The device even has a smart Bluetooth function which sends and stores moisture level readings straight to your smartphone for extra convenience. It’s a high quality tool which enjoys consistent high ratings on Amazon.com and one of the best pin-type moisture meters on the market.


The General Tools MMD7NP Pinless Moisture Meter

General Tools MMD7NP Moisture Meter

The General Tools MMD7NP Pinless Moisture Meter tests for moisture levels up to 1″ deep without damaging surface areas with pins.

It’s ideal for use on all types of wood, drywall and masonry surfaces. Just like the before mentioned MMD4E Moisture Meter, it also has a smart Bluetooth function which sends readings to an app on your smartphone. It’s other features include a powerfully bright LCD display screen so that you can clearly see readings from various angles, a low battery indicator, HOLD button, out of range alarm and a handy auto power-off function to preserve battery life.


The General Tools MMH800 All-In-One Moisture Meter

General Tools MMH800 All-In-One Moisture Meter

The General Tools MMH800 All-In-One Moisture Meter can be used as pin-type and pinless moisture meter. It’s renowned for its incredible accuracy and apart from being able to detect moisture levels, it can also detect the source of leaks.

The device comes with a host of additional features such as the ability to check and display ambient temperatures and humidity. Also, a HOLD and auto power-off function. It’s the preferred moisture detector tool among many building inspectors and flood damage responders.


Moisture Meter Comparison Table

Moisture MeterSizeWeightTypeBatteries IncludedLatest Price
MMD4E Moisture Meter5.5 x 9.5 x 1.4 Inches7.2 OuncesPin TypeYesHere
MMD7NP Moisture Meter1.1 x 3 x 6.5 Inches1.4 OuncesPinlessYesHere
MMH800 Moisture Meter3.6 x 8.1 x 12 Inches2 LbsAll In OneYesHere